function hook_field_storage_delete_revision

Delete a single revision of field data for an entity.

This hook is invoked from field_attach_delete_revision() to ask the field storage module to delete field revision data.

Deleting the current (most recently written) revision is not allowed as has undefined results.

Parameters

$entity_type: The entity type of entity, such as 'node' or 'user'.

$entity: The entity on which to operate. The revision to delete is indicated by the entity's revision ID property, as identified by hook_fieldable_info() for $entity_type.

$fields: An array listing the fields to delete. The keys and values of the array are field IDs.

Related topics

File

modules/field/field.api.php, line 2002

Code

function hook_field_storage_delete_revision($entity_type, $entity, $fields) {
    list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);
    if (isset($vid)) {
        foreach ($fields as $field_id) {
            $field = field_info_field_by_id($field_id);
            $revision_name = _field_sql_storage_revision_tablename($field);
            db_delete($revision_name)->condition('entity_type', $entity_type)
                ->condition('entity_id', $id)
                ->condition('revision_id', $vid)
                ->execute();
        }
    }
}